About 20 people gathered outside Dallas police headquarters Monday evening demanding transparency in the investigation of the fatal shooting of a mentally ill man by officers.

Jason Harrison, 38, was shot outside his Red Bird home June 14 after his mother, Shirley Marshall, called police. Marshall wanted her son, who suffered from bipolar disorder and schizophrenia, to be hospitalized.

When two officers arrived, police said, Harrison came out of the home with a screwdriver and became aggressive when told to drop it. Both officers shot at Harrison, who died at the scene.

Friends, family and members of Mothers Against Police Brutality, a Dallas-based group, said Monday they want more information released, including footage from one of the officer’s uniform cameras. They also asked for the officers’ weapons to be confiscated and for them to be returned to administrative leave pending review of the case by a grand jury.

“They just need to do a better job of being transparent, and we shouldn’t have to be suspicious of their investigation,” said Collette Flanagan, founder of the advocacy group.

Police released the names of the two officers, John Rogers and Andrew Hutchins, Monday. They were placed on routine administrative leave after the shooting, but are back at work. Both have been on the force for more than five years, said Maj. Max Geron.

Geron said it’s unlikely the footage from the uniform camera will be released while the investigation continues.

Harrison’s family said he had a history of mental illness and police had previously taken him to the hospital for treatment. Marshall said he was holding a small tool like the kind used for computer repairs.

Deputy Chief Gil Garza, who heads the crimes against persons division, has said the officers were protecting themselves.